System Sensor CO1224T - 4-Wire CO Detector Installation Manual
SS-500-000 1 I56-3111-006
Carbon Monoxide Detector
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6583
NOTICE: This manual shall be left with the owner/user of this equipment.
This product is intended for use in ordinary indoor locations.
• Listed to standard 2075
• Round shape allows for mounting in aesthetically demanding areas
• 4 wire, system monitored
• Optional CO detector replacement plate for previously installed detectors
• Local sounder
• Low current draw
• Alarm relay, Form C
• Trouble relay, Form A
• Dual LED’s
• Test/Hush button
• SEMS wiring terminals
• Mount to single gang electrical box or surface mount to wall or ceiling
• Optional drywall anchors included
Nominal: 12/24 VDC
Min: 10 VDC
Max: 33 VDC
Avg. Standby Current: 20 mA
Max Alarm Current: 40 mA (75 mA test)
Alarm Contact Ratings: 30 VDC @ 0.5 A
Trouble Contact Ratings: 30 VDC @ 0.5 A
Audible Signal (temp 4 tone): 85 dBA min. in alarm (at 10ft)
Max. Start-up Capacitance: 20 uF
Operating Temperature Range: 0° to 40°C (32° to 104°F)
Operating Humidity Range: 22 – 90% %RH
Weight: 7 oz
Wire Gauge Acceptance: 14-22 AWG
TABLE 1. DETECTOR OPERATION MODES:
Alarm Test OFF
(after CO is
Alarm Test: Will send alarm signal to panel.
Hush feature/Alarm Silence: If required, the audible alarm can be silenced
for 5 minutes by pushing the button marked “Test/Hush”. The red alarm light
will continue to flash in temp-4 pattern. If carbon monoxide is still present
after the 5 minute hush period, the audible alarm will sound. The hush facility
will not operate at levels above 350 ppm (parts per million) carbon monoxide.
RealTest Alarm Silence: Alarm will automatically silence after about 20 sec-
onds of alarm from spraying canned CO into the detector. Alarm Reset: Alarm
automatically resets after CO has cleared from the sensor.
Trouble feature: When the sensor supervision is in a trouble condition (such
as a sensor that has been tampered with), the detector will send a trouble sig-
nal to the panel. The detector must then be replaced. There is no local audible
signal when detector is in trouble.
End of Life Timer feature: When the detector has reached the end of its life,
the trouble contact will open. This indicates that the CO sensor inside the de-
tector has passed the end of its life and must be replaced. This detector’s lifes-
pan is approximately six years from the date of manufacture. There is no local
audible signal when detector is in trouble. Periodically check the “Replace by”
sticker located under the detector cover. The detector must be replaced by this
date. Refer to Detector Replacement on page 3.
Per UL 2075, it is mandatory that a trouble signal be sent to the panel
upon CO cell trouble or cell end of life. Refer to Figure 4 for wiring of the
CARBON MONOXIDE ALARM
LOCATION FOR MULTI-LEVEL RESIDENCE
FIGURE 1. ALARM LOCATION DIAGRAM:
SS-500-000 2 I56-3111-006
Ceiling: Detector should be at least 12 inches from any wall.
Wall: Detector should be at least as high as a light switch, and at least six
inches from the ceiling.
• Do not install in any environment that does not comply with the detec-
tor’s environmental specifications
• Install in accordance with NFPA 720–the Standard for the Installation of
Carbon Monoxide (CO) Detection and Warning Equipment
• As of 2009, NFPA 720 defines standards for both commercial and resi-
dential installations of CO detectors. If the installation can be interpreted
as a commercial application, consult the section of NFPA 720 that out-
lines commercial applications.
• For example, Chapter 188.8.131.52.1 states that carbon monoxide detectors
shall be installed in accordance with manufacturers published instruc-
tions in the following locations:
(1) On the ceiling in the same room as permanently installed fuel
(2) Centrally located on every habitable level and in every HVAC zone
of the building
• If the installation can be interpreted as residential, consult the section of
NFPA 720 that outlines residential applications.
• For example, chapter 184.108.40.206 states that carbon monoxide alarms or
detectors shall be installed as follows:
(1) Outside each separate dwelling unit sleeping area in the immedi-
ate vicinity of the bedrooms
(2) On every level of a dwelling unit, including basements
(3) Other locations where required by applicable laws, codes or standards
The CO1224T/CO1224TR can be ceiling-mounted or wall-mounted:
1. To a single gang box.
2. Direct mount to ceiling or to wall using drywall fasteners.
3. Mounted with optional replacement plate model CO-PLATE*.
WIRING INSTALLATION GUIDELINES
All wiring must be installed in compliance with the NFPA 70, National Electrical
Code, applicable state and local codes, and any special requirements of the local
Authority Having Jurisdiction (AHJ).
Proper wire gauges should be used. The conductors used to connect carbon
monoxide detectors to the alarm control panel and accessory devices should
be color-coded to reduce the likelihood of wiring errors. Improper connections
can prevent a system from responding properly in the event of a CO.
The screw terminals in the mounting base will accept 14-22 gauge wire. Wire
connections are made by stripping approximately
⁄4˝ of insulation from the
end of the feed wire, inserting it into the proper base terminal, and tightening
the screw to secure the wire in place. Do not put wires more than 2 gauge
apart under the same clamping plate.
WARNING: This product does not have a local audible trouble signal, and
may fail without supervision if trouble loop remains unconnected.
WARNING: Gas detectors on a zone that is bypassed may not signal a trouble
condition. Do not bypass zones used for gas detectors.
Wiring diagrams located on page 4, Figure 4.
Remove power from alarm control unit or initiating device circuits before in-
1. Using a small, flat head screw driver, push in the small tab located on the
underside of the detector. Once the snap is loosened, lift the bottom end of
the cover up and unhinge the top to remove the cover.
2. Wire the detector base screw terminals per Figure 5.
3. Screw the base of the detector onto a single gang electrical box, or to the
surface of the wall or ceiling. Use the hardware included in the packaging.
4. If mounting with the System Sensor replacement plate model CO-PLATE*:
* Hold replacement plate over desired mounting area.
* Use hook feature to hold CO1224T onto the replacement plate.
* Mount detector and plate together using hardware provided with
5. Hinge the top portion of the cover onto the base; with the cover at a 45
degree angle, fit the hinges into the slots of the base.
6. Push the unhinged bottom portion of the cover down until it snaps into place.
7. After all detectors have been installed, apply power to the alarm control unit.
8. Test each detector as described in Testing.
9. Notify the proper authorities that the system is in operation.
Airborne dust particles can enter the detector. System Sensor recommends
the installation of detectors before beginning construction or any other dust
producing activity. Carbon monoxide detectors are not to be used with detec-
tor guards unless the combination has been evaluated and found suitable for
Detector must be tested after installation.
NOTE: Before testing, notify the proper authorities to avoid any nuisance
Ensure proper wiring and power is applied. After power up, allow 80 seconds
for the detector to stabilize before testing.
Test the CO1224T/CO1224TR detector as follows:
1. A test button is located on the detector housing (See Figure 4).
2. Use the tip of your finger to press and hold the test button.
3. If the sounder beeps and the LED’s light up after 1-4 seconds, the detec-
tor is operational.
If a detector fails the above test method, its wiring should be checked. If the
detector still fails after rewiring, it should be replaced.
FIGURE 2. MOUNTING OF DETECTOR:
MOUNT DETECTOR TO
CENTER OF PLATE
FIGURE 3: MOUNTING OF CO1224T DETECTOR TO CO-PLATE*
CO DETECTOR REPLACEMENT PLATE
*NOTE: The CO-PLATE has not been evaluated or approved by a NRTL.
FUNCTIONAL GAS TEST
NOTE: Check with local codes and the AHJ to determine whether or not a
functional gas test is desired for an installation.
A canned CO testing agent may be used to verify the detector’s ability to sense
CO by utilizing the RealTest™ feature of the CO1224T/CO1224TR as follows:
1. Press the test button as described in Testing above. Release the test but-
ton after the sounder beeps and the LED’s light up.
2. The detector will enter the speed-up test mode, indicated by a quick
flashing green LED.
3. Within 20 seconds, apply a UL approved CO agent within 1/4” of the
detector’s gas entry ports (see Figure 3). The detector will quickly go into
alarm if gas entry is successful.
4. The detector will automatically exit the speed-up test mode 20-60 sec-
onds after entering speed-up test mode.
Testing the detector will activate the alarm relay and send a signal to the panel.
CAUTION: This carbon monoxide detector is designed for indoor use only. Do
not expose to rain or moisture. Do not knock or drop the detector. Do not open
or tamper with the detector as this could cause malfunction. The detector
will not protect against the risk of carbon monoxide poisoning if not properly
wired. The detector will only indicate the presence of carbon monoxide gas at
the sensor. Carbon monoxide gas may be present in other areas.
This carbon monoxide detector is NOT:
• Designed to detect smoke, fire or any gas other than carbon monoxide
• To be seen as a substitute for the proper servicing of fuel-burning appli-
ances or the sweeping of chimneys.
• To be used on an intermittent basis, or as a portable alarm for the spill-
age of combustion products from fuel-burning appliances or chimneys.
Carbon monoxide gas is a highly poisonous gas which is released when fuels
are burnt. It is invisible, has no smell and is therefore impossible to detect with
the human senses. Under normal conditions in a room where fuel burning
appliances are well maintained and correctly ventilated, the amount of carbon
monoxide released into the room by appliances should not be dangerous.
Symptoms of carbon monoxide poisoning: Carbon monoxide bonds to the
hemoglobin in the blood and reduces the amount of oxygen being circulated
in the body. The following symptoms are examples taken from NFPA 720.
They represent approximate values for healthy adults:
Many causes of reported carbon monoxide poisoning indicate that while vic-
tims are aware that they are not well, they become so disoriented that they
are unable to save themselves by either exiting the building or calling for
Also young children and pets may be the first to be affected.
Per UL standard 2075, the CO1224T/CO1224TR has been tested to the sensi-
tivity limits defined in UL standard 2034.
Alarm thresholds are as follows:
What to do if the carbon monoxide detector goes into alarm:
Immediately move to a spot where fresh air is available, preferably outdoors.
Find a phone in an area where the air is safe and call your security service
provider. Tell your provider the detector alarm status, and that you require
professional assistance in ridding your home of the carbon monoxide.
IMPORTANT: This detector should be tested and maintained regularly follow-
ing National Fire Protection Association (NFPA) 720 requirements.
Occasionally clean the outside casing with a cloth. Ensure that the holes on
the front of the alarm are not blocked with dirt and dust.
Do not paint, and do not use cleaning agents, bleach, or polish on the detector.
This detector is manufactured with a long-life carbon monoxide sensor. Over
time the sensor will lose sensitivity, and will need to be replaced with a new
System Sensor carbon monoxide detector. This detector’s lifespan is approxi-
mately six years from the date of manufacture.
Periodically check the detector’s replacement date. Remove the detector cover
and refer to the sticker placed on the inside of the detector. The sticker will
indicate the date that the detector shall be replaced.
This detector is also equipped with a feature that will open the trouble relay
once it has reached the end of its useful life. If this occurs, it is time to replace
NOTE: Before replacing the detector, notify the proper authorities that main-
tenance is being performed and the system will be temporarily out of service.
Disable the zone or system undergoing maintenance to prevent any unwanted
alarms. Dispose of detector in accordance with any local regulations.
SS-500-000 3 I56-3111-006
Parts Per Million Detector response time, min.
30 ±3ppm No alarm within 30 days
70 ±5ppm 60-240
150 ±5ppm 10-50
400 ±10ppm 4-15
Concentration (ppm CO) Symptoms
200 Mild headache after 2-3 hours
400 Headache and nausea after
1-2 hours of exposure
800 headache, nausea, and dizziness
after 45 minutes of exposure;
collapse and unconsciousness
after 2 hours of exposure
FIGURE 4. TEST BUTTON LOCATION AND OPERATION:
SS-500-000 4 I56-3111-006
©2011 System Sensor
System Sensor warrants its enclosed product to be free from defects in materi-
als and workmanship under normal use and service for a period of three years
from date of manufacture. System Sensor makes no other express warranty
for the enclosed product. No agent, representative, dealer, or employee of the
Company has the authority to increase or alter the obligations or limitations
of this Warranty. The Company’s obligation of this Warranty shall be limited
to the replacement of any part of the product which is found to be defective
in materials or workmanship under normal use and service during the three
year period commencing with the date of manufacture. After phoning System
Sensor’s toll free number 800-SENSOR2 (736-7672) for a Return Authorization
number, send defective units postage prepaid to: System Sensor, Returns
Department, RA #__________, 3825 Ohio Avenue, St. Charles, IL 60174. Please
include a note describing the malfunction and suspected cause of failure.
The Company shall not be obligated to replace units which are found to be
defective because of damage, unreasonable use, modifications, or alterations
occurring after the date of manufacture. In no case shall the Company be
liable for any consequential or incidental damages for breach of this or any
other Warranty, expressed or implied whatsoever, even if the loss or damage
is caused by the Company’s negligence or fault. Some states do not allow the
exclusion or limitation of incidental or consequential damages, so the above
limitation or exclusion may not apply to you. This Warranty gives you specific
legal rights, and you may also have other rights which vary from state to state.
THREE-YEAR LIMITED WARRANTY
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause undesired operation.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used
in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installa-
tion. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try
to correct the interference by one or more of the following measures:
– Reorient or relocate the receiving antenna.
– Increase the separation between the equipment and receiver.
– Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
– Consult the dealer or an experienced radio/TV technician for help.
Please refer to insert for the limitations of Carbon Monoxide Detectors
FIGURE 5. WIRING DIAGRAM:
OUTER CIRCLE IS FOR
Input powered (12 or 24 VDC) from UL Listed Fire/Burg Control Panel (Class 2).
SPECIFIED BY PANEL
AND NO FAULT
SINGLE UNIT, SINGLE ZONE, 4 CONDUCTOR CABLE
SUPERVISORY TROUBLE CONTACTS
SPECIFIED BY PANEL
T T T T
+ − + −
AND NO FAULT
MULTIPLE UNIT, SINGLE ZONE, 6 CONDUCTOR CABLE
It should be noted the installation, operation, testing and maintenance of
the CO1224T/CO1224TR is different than System Sensor conventional 4-wire
smoke detectors, such as the i3 Series. Below are specific installation require-
ments for the CO1224T/CO1224TR:
• Connect to a non-resettable power supply
• Connect to a non-fire zone: Per NFPA 720 section 220.127.116.11 the CO1224T/
CO1224TR shall not be connected to a zone that signals a fire condition
• Per NFPA 720 section 9.6.7, do not connect the CO1224T/CO1224TR on
a zone with other fire or intrusion initiating devices - i.e. do not connect
on the same zone as smoke detectors
• Wiring of the trouble relay is mandatory: Per UL Standard 2075 section
17.1.1 a detector shall send a trouble signal to the control panel upon an
open circuit, a ground fault, sensor removal or sensor end of life
• If wiring one CO1224T/CO1224TR per zone: Use 4 conductors
• If wiring multiple CO1224T/CO1224TR detectors per zone: Use 4 con-
ductors from panel to first CO1224T/CO1224TR, then use 6 conductors
from the second CO1224T/CO1224TR to other detectors on the zone